1006 Al 合金の半凝固ロールキャスティング

概要

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Semisolid strip casting of AC4C aluminum alloy for casting was tried using a melt drag twin roll caster equipped with a cooling slope. Semisolid slurry was made from melt only pouring the melt on the cooling slope. The melt drag twin roll caster was improved into a semisolid twin roll caster only equipping the cooling slope without modification. Casting speed of AC4C strip could be improved up to 90 m/min by the effect of the semisolid strip casting. The microstructure of the strip cast from semisolid slurry was different from that of the strip cast from the molten metal. Primary crystal of the semisolid cast strip was spherical. Eutectic Si was very fine and globular. Mechanical property of AC4C strip after homogenization, cold rolling and T6 heat treatment was as below, UTS : 270 MPa, 0.2%proof stress : 190 MPa and elongation : 18%. The elongation was especially improved by the semisolid strip casting.